#define _CRT_SECURE_NO_WARNINGS 1
#include"Stack.h"
void STInit(ST* ps)
{
	assert(ps);
	ps->arr = NULL;
	ps->top = ps->capacity = 0;

}
void STPush(ST* ps,STDataType x)
{
	assert(ps);
	if (ps->capacity == ps->top)
	{
		int newcapacity = ps->capacity == 0 ? 4 : 2 * ps->capacity;
		STDataType* temp = (STDataType*)realloc(ps->arr,newcapacity * sizeof(STDataType));
		if (temp == NULL)
		{
			perror("relloc fail");
			exit(1);
		}
		ps->arr = temp;
		ps->capacity = newcapacity;
	}
	ps->arr[ps->top++] = x;
}
bool STEmpty(ST* ps)
{
	assert(ps);
	return ps->top == 0;
}
void STPop(ST* ps)
{
	assert(ps);
	assert(!STEmpty(ps));
	ps->top--;
}
STDataType STTop(ST* ps)
{
	assert(ps);
	assert(!STEmpty(ps));
	return ps->arr[ps->top - 1];
}
int STSize(ST* ps)
{
	assert(ps);
	return  ps->top;
}
void STDestroy(ST* ps)
{
	assert(ps);
	if (ps->arr)
	{
		free(ps->arr);
	}
	ps->arr = NULL;
	ps->capacity = ps->top = 0;
}